Yellow belly (flee) magic effect not working on settlers

[SAC]

Hi,

 

For my exploding collar mod, I cannot make the settlers flee. I made a spell that casts the flee (aka yellow belly) effect - the same one the "yellow belly" syringer ammo uses - and it works, but only on raiders. When cast on settlers, they just ignore it completely. 

 

Settlers also ignore being hit with the same syringer, so it's not a problem of my mod / spell, but rather they are unaffected by the magic effect.

 

I don't think they are immune to poison, because hallucigen affects them, making them frenzy. But what I want to achieve is flee, not frenzy.

 

Not sure how should I modify the magic effect in order to affect settlers as well, because I don't know what makes them immune in the first place. Or maybe they just don't have the AI to flee? Rather doubt it.

 

Thanks!